دانلود کتاب انتقال توان بی‌سیم متقارن در زمان برابری

Wireless power transfer (WPT) technology has been a research hotspot at home and abroad in recent years, it does not need wires or other physical contact, directly converts electrical energy into electromagnetic waves, light waves, sound waves, and other energy forms, and transmits energy from the power supply to the load through space, which has significant advantages such as safety, convenience and easy intelligence, and the industrialization prospect is very promising. However, wireless charging for electrical devices against the variation of coupling conditions poses a great challenge to the robustness of WPT systems. A robust magnetic-field coupled wireless power transfer (MC-WPT) system using a nonlinear parity-time (PT)-symmetric circuit is proven to realize the stable output power and efficiency. Inspired by this system and technique, we proposed a highly efficient realization of the nonlinear PT-symmetric circuit, and applied it to the drone-in-flight wireless charging platform, achieving the first application of PTsymmetric MC-WPT system. In addition, we have realized the constant controlled power, constant voltage, constant current, etc. of the PT-symmetric MC-WPT system, and extended it to the application of multi-load and multi-relay-coil. Meanwhile, we have further presented a variety of techniques for improving the performances of PT-symmetric WPT systems. More importantly, we introduced PT symmetry into the electric-field coupled wireless power transfer (EC-WPT) system and electricmagnetic coupled hybrid wireless power transfer system (HWPT) for the first time, further expanding the application prospects of the PT-symmetric WPT system. This monograph consists of eleven chapters. Chapter 1 mainly expounds the development, research status and existing problems of wireless power transfer technology, and then elaborates the introduction of parity-time symmetry into wireless power transfer system. Chapter 2 introduces the basic principles of PT symmetry and the representation of PT symmetry in circuits, and states the coupled RLC circuits with PT symmetry and the realization method of negative resistor. Chapter 3 mainly focuses on PT-symmetric MC-WPT system, introduces the basic structure of the system, establishes the system model, and analyzes the system characteristics. Chapter 4 introduces the PT-symmetric MC-WPT system with constant output power against distance variation and misalignment, including system structure, characteristic analysis, control strategy, system design and verification. Chapter 5 introduces the PT-symmetric MC-WPT system with constant controllable power against distance variation and misalignment, including system modeling and characteristic analysis, control and implementation, system design and verification. Chapter 6 introduces the PT-symmetric MC-WPT system with constant voltage (CV) and constant current (CC), including system structure and characteristic analysis, control and implementation, system design and verification. Chapter 7 focuses on multi-load applications, analyzes the system structure and characteristics of the multi-load PT-symmetric MC-WPT systems, and gives the system design and implementation. Chapter 8 is dedicated to the PT-symmetric MC-WPT system with relay coils, analyzes the PT-symmetric condition, operating frequency, output power and transfer efficiency of the multi-relay-coil system. Chapter 9 introduces several techniques for improving performances of PT-symmetric WPT system, such as improvement of transfer distance, reduction of switching frequency and switching losses, threephase PT-symmetric WPT and quasi-PT-symmetric WPT. Chapter 10 extends the PT-symmetric system to the PT-symmetric EC-WPT system, analyzes the structure, modeling and characteristics of the PT-symmetric EC-WPT system, and gives the system design and verification. Chapter 11 extends the PT-symmetric system to the PT-symmetric HWPT system, analyzes the system structure, modeling and characteristics of the PT-symmetric HWPT system, and gives the system design and verification. This monograph is the result of our research on parity-time-symmetric wireless power transfer, we hope that it is helpful for more graduate students and researchers involved in the area of electrical engineering to study parity-time-symmetric wireless power transfer systems.